Calvinism has been absolutely destructive for western society and some protestant theology. Calvinism saved the soul from hell but forgot to save the human being. It's hyper focused on getting into heaven as a legal contract instead of transformation.
When you start with Total Depravity as a permanent ontological condition rather than a diagnosis that grace actually heals, you end up with a framework where we never become anything new in Christ.
If human nature can't be genuinely elevated, united, and transformed by grace, then the Incarnation didn't accomplish what the Fathers said it did: the union of the divine and human natures in one Person, making humanity itself capable of bearing God. Christ didn't come to absorb a legal penalty. He came to restore and elevate what Adam lost, to recapitulate humanity, and to open the way for us to become partakers of the divine nature (2 Peter 1:4) not a medieval legal theory.
If the human person never truly becomes anything, the saints are just pardoned criminals: not glorified images of God reflecting uncreated light. And if that's true, why would you venerate them? Why would Mary matter? Why would the Incarnation require a pure vessel at all?
When I started to understand this, I could look at someone I didn't know and cry for them. You will weep for the world, feel responsible for everyone and see Christ's face in every human being you pass.